It would be nice to add support for the CiA 311 XML device description. Currently, library supports parsing EDS, DCF, and EPF files via canopen.objectdictionary.import_od() and canopen.network.Network.add_node(). Attempting to load an .xdc file results in a NotImplementedError.

The XML device description is mandatory for CANopen FD devices, so it's a possible prerequisite for #449.
Unfortunately the format specification is hidden behind the member wall. :/